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DRV2624: How to determine why Auto Calibration fails?

Jackson Ward
Prodigy 120 points
Part Number: DRV2624

I'm using the DRV2624 with a ERM actuator.

Every time I run the calibration I get a reported failure.

How can I tell what caused the failure?

After the attempt register 0x01 reports 0x88.. so this means the process is DONE and it Failed.

The diag_Z_result register is 0. 

Where is the information on why it failed?

  • 0
    TI__Guru** 108395 points
    Hi Jackson,

    Have you verified that the required input values for Auto-Calibration are correct and aligned with the actuator specs?
    diag_z result = 0 would mean that the resistance measurement could not be completed. Is the actuator properly connected to the driver? Supply voltage to the driver are correct, completely powered up and stable?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Prodigy 120 points

    Well, I was hoping that there would be some output to help me verify my settings.

    I have the motor firmly mounted in its proper orientation. And I don't see any connection issues. When I run it at the rated voltage in open-loop mode I see the current exactly match the actuator's datasheet.

    I used the Excel calculator to set the RATED_VOLTAGE register for default inputs and the actual rated voltage of the actuator is 5V. The actuator can handle 7.5 V bursts, but since I am using 5 V to power the drive I just set OD_CLAMP using the Excel calculator and a target overdrive of 5V. I was thinking this effectively disables Overdrive. I can't make it set for 7.5 V anyway because for every set of inputs that I've tried this would put OD_CLAMP > 255 which is impossible.

    I use the trigger input to let the Auto-Calibration to run for ten seconds.

    I have played with a few different Blank Times and Drive Times and always the same result.

  • 0 in reply to Jackson Ward
    TI__Guru** 108395 points
    Jackson,

    Could you provide details about the actuators you're using? The data sheet would be good to take a look.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Prodigy 120 points
    Ivan,

    That would be very helpful. Can I send you the information privately?

    Thanks,
  • 0 in reply to Jackson Ward
    TI__Guru** 108395 points
    You can e-mail me at: ivan.salazar@ti.com
    I'll close this thread on the forum since we'll work on this offline.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators